Back WAL-Prinzip German Registro de escritura anticipada Spanish پیشنویس ثبت وقایع Persian Write-ahead logging French ログ先行書き込み Japanese 로그 선행 기입 Korean Write-ahead logging Mongolian Упреждающая журнализация Russian WAL-журналювання Ukrainian 预写式日志 Chinese
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In computer science, write-ahead logging (WAL) is a family of techniques for providing atomicity and durability (two of the ACID properties) in database systems.[1]
A write ahead log is an append-only auxiliary disk-resident structure used for crash and transaction recovery. The changes are first recorded in the log, which must be written to stable storage, before the changes are written to the database.[2]
- ^ Hellerstein, Joseph M.; Stonebraker, Michael; Hamilton, James (2007). Architecture of a database system. Boston: Now. ISBN 978-1-60198-079-3. OCLC 191079239.
- ^ "30.3. Write-Ahead Logging (WAL)". PostgreSQL Documentation. 2023-05-11. Archived from the original on 2025-04-08. Retrieved 2023-06-05.
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